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In this work, the heat of absorption of CO"2 in aqueous blends of 2-(diethylamino)ethanol (DEEA) and 3-(methylamino)propylamine (MAPA) were measured as a function of CO"2 loading at 40^oC, 80^oC and 120^oC. The main objective was to investigate the effect of concentration of MAPA on the heat of absorption. Furthermore, from the total pressure measurements the partial pressure of CO"2 was estimated and cyclic capacities were calculated. The study included systems forming one and two liquid phases during CO"2 absorption. The results show that increasing the concentration of MAPA in a 3M DEEA solution raised the heat of absorption at all temperatures. Similarly the cyclic capacity increased with the rise of MAPA content in 3M DEEA blends. However, increasing the MAPA concentration up to 5M and simultaneously decreasing the DEEA concentration to 1M, decreased the cyclic capacity.
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